The High Energy Transmission Grating Spectrometer ( HETGS ) works over 0.4 10 keV and has a spectral resolution of 60 1000.
2.
The Low Energy Transmission Grating Spectrometer ( LETGS ) has a range of 0.09 3 keV and a resolution of 40 2000.
3.
Where N is the total number of slits in the array, or transmission grating, and the term in parentheses represents the phase that is directly related to the exact path differences derived from the geometry of the N-slit array ( " j " ), the intra interferometric distance, and the interferometric plane " x ".
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